condition mean min max ZT0-3 32.4 32.4 32.4 ZT4-7 6.5 6.5 6.5 ZT8-11 28.5 28.5 28.5 ZT12-15 44.25 44.25 44.25 ZT16-19 37.05 37.05 37.05 ZT20-23 53.45 53.45 53.45